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Wetlands and b ioretention systems: Landscape filters in the Bay watershed

Wetlands and b ioretention systems: Landscape filters in the Bay watershed. Andrew H. Baldwin baldwin@umd.edu Department of Environmental Science and Technology. Brackish marsh. Saltmarsh mallow. Pickerelweed. Red maple/skunk cabbage swamp. G. Kearns. Bald eagle. White-footed mouse.

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Wetlands and b ioretention systems: Landscape filters in the Bay watershed

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  1. Wetlands and bioretention systems: Landscape filters in the Bay watershed Andrew H. Baldwin baldwin@umd.edu Department of Environmental Science and Technology

  2. Brackish marsh Saltmarsh mallow Pickerelweed Red maple/skunk cabbage swamp

  3. G. Kearns Bald eagle White-footed mouse M. Perry Green sunfish Blue crab R. Aguilar Fishing spider A. Young

  4. Wetlands lie between dry land and the Bay SEVERN RIVER CHES BAY ANNAPOLIS PATUXEN T RIVER SOUTH RIVER NWI Wetlands Mapper

  5. They intercept runoff and groundwater SEVERN RIVER CHES BAY ANNAPOLIS PATUXEN T RIVER SOUTH RIVER

  6. N2 gas (nitrogen removal) Sediment and phosphorus burial

  7. Strategic restoration and creation of wetlands for water quality improvement Mitsch et al. 2001

  8. Urban Stormwater Wetland Stormwater wetland at the University of Maryland, College Park. Runoff from the parking lot enters the wetland from the left, flows in a roughly U-shaped counterclockwise pattern, and discharges via a riser a the top center of the wetland. Photo by A.H. Baldwin.

  9. * * * * Constructed wetlands for wastewater treatment (e.g. dairy farm effluent) Surface Flow (SF) Wetland Soil substrate over impermeable layer (clay, bentonite, liner) Subsurface Flow (SSF) Wetland Gravel substrate over impermeable layer

  10. Bioretention systems These are not wetlands! PG County Bioretention Manual, 2009 To groundwater - Store and slowly release surface runoff to streams or groundwater (reduced flood peaks) - Filter out sediment - Remove sorbed pollutants (e.g. phosphorus and metals) To stream

  11. Laurel Hospital Ivy Club Apartments King’s Contrivance Greenbelt Plaza

  12. Conclusions • Wetlands and bioretention systems improve Bay water quality • “Kidneys of the landscape” • Provide biodiversity, flood storage, and other ecosystem services K. Jensen Thank you!

  13. Supplemental slides

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